Active pressure vessel external cooling system of non

The utility model belongs to the technical field of the nuclear safety, a active pressure vessel external cooling system of non - is related to. The system have the sealing layer pressure vessel's outside the encirclement, and pressure vessel with the sealing layer between form annular confined space, the cooling water pours into case by freezing water -infusion pipeline connection into the sealing layer to can pour into the cooling water into when the nuclear accident annular confined space and flood the low head, wherein annular confined space be connected through steam turbine admission pipeline and steam turbine, steam turbine pass through transmission and be connected with the water pump, the water pump pass through the pump exhalent siphon line with annular confined space connect. The utility model discloses a system establishs the back, and the cooling water constantly pours into annular confined space into, continuously cools off the pressure vessel outer wall to the decay heat of reactor core melts d